Seagate ST32430N Product Manual - Page 19
Product Manual - Hawk 2LP Family SCSI-2 Volume 1, Rev. A, Notes for s 5.2 and 5.3.
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Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. A 11 5.3.1 Notes for sections 5.2 and 5.3. [1] Execution time measured from receipt of the last Byte of the Command Descriptor Block (CDB) to the request for a Status Byte Transfer to the Initiator (excluding connect/disconnect). [2] Maximum times are specified over the worst case conditions of temperature, voltage margins and drive orientation. When comparing specified access times, care should be taken to distinguish between typical access times and maximum access times. The best comparison is obtained by system benchmark tests conducted under identical conditions. Maximum times do not include error recovery. [3] Typical Access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives. [4] Assumes no errors and no sector has been relocated. [5] Rate measured from the start of the first sector transfer to or from the Host. [6] Assumes the Initiator immediately sends Write Data to the drive when requested. [7] Command execution requires a data transfer phase (data to or from the disc media). Assumes the initiator is instantly ready to send or receive the data when the drive generates first request for a data byte transfer, and assumes an average data transfer rate between the drive and the Initiator as specified in section 5.3. [8] All performance characteristics assume that automatic adaptive temperature compensation is not in process when the SCSI command is received. The following paragraphs give highlights of thermal calibration operation. a. At spin-up, all heads are calibrated on the outer and inner diameter calibration tracks. b. A timed calibration occurs 1 minute after spin-up, and every 10 minutes thereafter. During these timed calibrations, the firmware alternates between the inner and outer diameter calibration tracks. For example, all heads are calibrated on the inner track, then 10 minutes later all heads are calibrated on the outer track. Automatic adaptive temperature calibration does not interrupt SCSI commands being executed. c. If automatic adaptive thermal calibration is in process when the drive receives a SCSI command, the drive queues the command until the compensation for the specific head being compensated completes. When compensation completes for the specific head being compensated, the drive executes the first queued command. When execution of the first queued command completes, the drive continues compensation for the remaining head(s). The above procedure continues until the drive completes compensation for all heads. d. When a timed calibration comes due, the drive postpones the calibration until the drive has been idle for 25 to 50 milliseconds. e. When the drive receives a Write command, the drive performs a single head calibration if a calibration has been delayed for 1 to 5 minutes. The drive performs an uninterruptible calibration of all heads if the calibration has been delayed more than 5 minutes. f. The drive preforms a calibration of all heads prior to the first retry of any media error if a timed calibration has been delayed for over one minute. g. Automatic adaptive temperature compensation takes less than 0.1% of bus time. h. Automatic adaptive temperature compensation occurs at times other than mentioned above, but should be transparent to the user (e.g., during execution of Format, Rezero, and Reassign Block commands). i. A rezero command can be used to reset the Automatic adaptive temperature compensation timer back to start so that the host can know when the interruption for timed thermal compensation will occur. [9] Assumes system ability to support 5.2 Mb/s and no cable loss. [10] Simulated. __________ *SCSI commands are described in the SCSI Interface manual, 77738479.
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